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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0606af3df01dab1f7431881e302933daf89e5586353058cb967eacc682bc0f9a' 
  AND token = 'ZXplltZKWL9v2dC7WP2xWmfgSa0ECp2iL3S+0Bsv+24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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