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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbed5edeb3c70fc481b2c4807c17b39a9dc7a980eab4486065ca00f8af5b2771' 
  AND token = 'jNf2HZl+FfBlxmRjc7Cp0NuiEq3xSWo+j9cQ3LGQoZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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