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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '537c6acdc28438c39ddcdae87990ecb13db945cf65357e63e448dfc5d3ebfa66' 
  AND token = 'gNIdio77b6BdL69PPIOuh3dforqWBmUOZBQgHofkQvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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