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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa8e0c71f278a8457447ec019e446ea5f00c53b1d60a5ccc42a9a2bd013ae8f9' 
  AND token = 'lTZldizBnBfRrZ6PqpQSIK1jkJLI/3e1cn29ReHhENg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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