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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac6c372fdb366f556e6dbbf6a8b8d90155b39288c9241953c3f9a62e8b661f25' 
  AND token = 'hc86YidPlUc55uTNM45inOxYC2KIdBnsO3EmqKWORAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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