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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d9d24dc78f4ebe24b3cff54f36d02d2d33cf41adcf4742bb3b3c406af9135d0' 
  AND token = 'UnVkQRYaisKIE0RFshMQXBwslVxJM8dqEU/YxXbUR0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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