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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccd4bbc8b46ab278c86c8d69dfcf3c10246cc692d4a724f9b742a8647089b033' 
  AND token = 'ZQaNjOeoarZ2sDydexREnxDNwp+FcTaT//rqYoA2JtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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