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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adbe96f0ccd2b45ca63bc8eeae152f5ccb2417338aac1cbc67a5e658c380cf9c' 
  AND token = 'oqcM0g1MbTeDyBcimFZ7LyN5TSfrSHse27PYazMnS+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}