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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca341c2ad0548e110918567d9dde266d41069d80ae2d89f363fbea3a48100b20' 
  AND token = '8rCkWmRpqR9p6erVYnoYXjFuI4OTKU2TlmQ9hr7po5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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