SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b71cd921e418cce5172f0b1afeb207d1b44c2e5750dea2d8df86a68428db096f' 
  AND token = 'LzjBZ95rkmnN+AWcOs3Q1NF4h1SVZwL+xARqgmWngfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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