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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3738a3f925b0f1e9e4ca013fec921e80b1f7608f9f72f67dc97085708a38280d' 
  AND token = 'rHHyaNpsRUc9LjwclyxhdltU7kvq1paWz8klA11buzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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