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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdf7b67dada08731a7df7bc2eba46094685f1f3c77a3555b285b923bd14bec47' 
  AND token = 'B1atpVVwtKwy8vRaybu8mnmiX5M0lpfjmSNNxaoYT3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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