SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '652e7b109e4ce62940f2d763ec0eca3fe49cedc20992a9533db8449d556837a2' 
  AND token = 'QbKRzrKx5oC938kg4i6eGnNJTY+fRqLTLtT7ZHIw/8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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