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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '972b92c2dc1bc0ebde9688fe124e8cb8f9f115a79a8d46525b3380080018fb7b' 
  AND token = '1pVhtrGeZvwSwey7wxPROiR0G6awnOMHCh/Iolf+Kik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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