SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7eb2079a017b6fa976f0ca49bfbc34882234a022271dde74697eeea5de007b3b' 
  AND token = 'rrhVcQF3LujbfZIvpO/fR4YoAALHvlfUv/fAWiwK+ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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