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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '480c1c2508e019199b0d6ab7aa0b731efac09036c3dce77633cf6d11da59fb09' 
  AND token = 'Jux2SIp9a0HRY3HCdlaThqP46Vz6eShftXrqjsNykuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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