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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd077ef059cdf1a7418be7527442ae25f895d7dc8e6578a9319ee098967400a3a' 
  AND token = 'YM381Q5YOOYVhlPYLavEGevv4DPz6EiklDVCblzT15Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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