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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f02f84e1d240500e5c5bfd9f1ede7d8b41b5021d9e26d0892f720d9cc83c30ec' 
  AND token = 'wQuiOLrNtHwQ/1/OqKfp62f/LsFjCqjM3DkQJJ0IBaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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