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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e88bf245e43e1fd03ca92d4614cbf1a77af5fce6f3622b9406af0d11fac79d9' 
  AND token = 'YqZsL0yLU6qwkXNUAHnq2lWC3DHUerlJURlwsclVVBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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