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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '095885d079ecd7e491d16fe4e184eff11f07117928e9efaa033c3d0888effdc0' 
  AND token = 'TkVL8vjSF9Rf7KeHyK400DmvkvILeaxH1reRgZZi9dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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