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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '393f02431ac1388e72d21dae06bf9406a96f4b1225606c577dc96e2bcd757e13' 
  AND token = 'L2pSVdOJHzWDDdX1WrxMZog5ZToxfab1Va1eJf8eRUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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