SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e376d35ff167b8f8c0ed9a76479f152ca6d877ff5601f577ebb84d2bf7e09fba' 
  AND token = '3ijMPGjkWRcGxO5Ve/tHZ2MCT5vVPp2FjTTyWxguLg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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