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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '416b0634513530a2c6fba427e621a3e16ac5beeaa193b26ac3e350aebaaed73f' 
  AND token = 'p1P8AjhAeDNWKzIsnO5v3VAtp2VJTp8AvduRXceHAHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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