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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f18805bda1bd067dbc14ba454048ec158f2de7fbb0cc407a3bfa9dfac3dd6082' 
  AND token = 'bK7JNNBxi2pf/uEeftuAU4cmLrJjHf65rfLEeGbUYtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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