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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07ba3dc78d3b1d17ee18c0668a88573488427f8f7015a1810dad04b8a766e76f' 
  AND token = 'SmjsRuw4RaMQY0ImUlmMt0DkG5QG/l3ht8m9gRPcqVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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