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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b2baad9433068d6df9c7a37debd17d3636a0e2b734be418e59385f5f0007215' 
  AND token = 'huzLjcopShF5kMfb7eZnSbvXZ1mlcEtRVCQ52XM5PEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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