SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68f1881774f7c5d0e0a966c28a26bf620d943714a5f485e2f28b61f0263a52da' 
  AND token = 'cBzhkbr5AMyXmXq4Yg37zy1B4HkqudVjIkJkmsiBN54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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