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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46db5dca73ff64be2cc66c3543d21c3e937a6af5c7a5b49e3a83c140d68ae117' 
  AND token = 'ZAFbFcnRip2nSUMHYUORdS2Mj3d20PMhferIpne9SBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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