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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dff9d8ad4c48da45c57c5db0544c56c7c56000faf9b02ed9ee533c57400f2c80' 
  AND token = 'zs/v0iIWjCeOkjgH+wlZvI5KC7Cv8AB8qTC9CMrJNDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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