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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f58759b94d8dede129b981f8dc9b179817b64dbf244c37ee3ea030af8b9af0ea' 
  AND token = 'hKHGGQftebYhlD5aNBCCIlKBZdbSn52scxV5wJMohTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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