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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e61d9ccdeefeea400afc0df3129224f61ce2eb560ae78c0d8405e2e4f8beec01' 
  AND token = 'TES4Oh4t4ZABsUjtmkj9otwhJRuWRty+BCAS5W3MTLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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