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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65601190e1d260fa66a1c20542d34f82089f540c7baa90fb7bc0fc3e9dc0645a' 
  AND token = '5ieCZgLIp3nMQvQUgOl0/7ZS0CNH5V0CqZSFBpATLbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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