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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae28ff5280dd392c7fbdb413d644688ab907d0a00bd149fe395ae4eabdcb863b' 
  AND token = 'XWTjQOvDST4NeqB9SxZZaMuRryxD9x3WZR04P9yqSEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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