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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a90e8a4c0b852866c2452096080b31c7a47f4280fc2f95d7f4bd38393417652e' 
  AND token = 'nmueoKd833eQzx1xU5MGmctmMSb4J/p2OCcv53MCVl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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