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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88a50708a820e686904294fc68c0a627274bd51be3dd88544b510de0e4c0b596' 
  AND token = 'KrO3QfOUGlzkth8yD7JCl3u/UyoYJGxVAQAX5OelXUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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