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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dea90f76e16c357057d13e221a26b55395f391c93c5260d28954e371900feb9f' 
  AND token = '51Ph6z9yjx+dSvX/IEj6cUEHLSG3akUOhAQdV3cS/XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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