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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96de8c243f1d1262fc969061a331772ff0383432ba81024fbbb89fb8e55b9291' 
  AND token = 'yqYyRndMllU6+CeupYbtqUb2lE05acnSWcEx1jLZJGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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