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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ba495f6071623adacd67bf1d8e14b149836a8d62c77b2ff71d7cf0ef7f20fa2' 
  AND token = '3mj3NFv8n2nqPW9siUIX6D0MYZ88RaUsete2EBTyjAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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