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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f07ee952e86fe9785e5ecb39d612e6030a2744377c82f8639b89f1d3f5009fc' 
  AND token = 'p9TFOXuD32xE1hyR7OwkuMpOx6sd/Phlh/7C/gzu64I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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