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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b4a9805376a528b0809e74b385f208bb059e9b47097469da90492cb0730f1b2' 
  AND token = 'c8pOlZ/9ioguhzUEKOZUo9JqRxU6iZiHHmNBOk2RUfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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