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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb1c406c172b044c6252cda4a78ccb2eaeb93514eb185b05ff2a9ddb9bde6e47' 
  AND token = 'ZKIM+Y1BAsz8Gc005OdEGZrl+TxgdEsL0VFoOQWi/sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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