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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ca15b37ffa8f21d9ae749dccfa1cd16c76a3dab83ea2ae0f99b79c82c3396b0' 
  AND token = '2ckekaSSw16jEBGSsNP9MyCN6tbQyfIw4iLR70iQrqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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