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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b041630a049b946fb3e71d2a5cd6a22f8e8644bb31bba4c9ca2a1834e514b7f' 
  AND token = '8M1fEveX61AqAYcJStDMNhcWsawCPx8F2zP3vm0bpqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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