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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c8bcde6c493b5ba91385eaf7905e11ae1c45105cadf10e77ee1ff4099dd3e89' 
  AND token = 'O8kB2pRZWgnAB4yonT+ShbLyyEaRcx6v09tfIuc4sgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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