SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9411c23fb74cf3e17a26839fc69ff61e37978e89b91e22a9689c95a1c09455d5' 
  AND token = '81Km0v97d2FoVWgwQtt9tYj+nf7BOBJpBcOJntI4JzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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