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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '064b849b17004e57996aaf13b79f0919563b108c1cb4acda7efc6c2652a821d5' 
  AND token = 'fQL4osG01FYaGpXy7VeicRLTNd8q7l6XtQ3H/EVWhfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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