SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '658feb4591e66598d3f4237951aaacc96e4dc6fdb615a45f05a9047874520a02' 
  AND token = 'hgUKdsOLClckhrgt1++O2z5SV/PqTNL8tEOARELWdv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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