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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbb2d391274a85cdc284345558cb957ade8e2639c5c6509f85484e1a624b7fae' 
  AND token = 'fooR20Nq2lOZt16Ez1yjaDK43WV4nHu5Fyly0wS5nC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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