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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f37cfc05437cca070061ea00237e068745c2ffefd285cd4a822624387b27a6a0' 
  AND token = 'nS3b8dTLUQo2GIEnvJL+YivLpLGk+l6yrPSOwRUkhqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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