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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c9be062cd341787800516440568b4951c8d6a8186b2dc16b95d1e051fcefe81' 
  AND token = 'r8VS/oKOglMhVwI7C8QccYvU65yklLQq7CKlvG8pkO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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