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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '272832f06163e04c671d4055d264c156da558dbe813552941886ece76feb0e01' 
  AND token = '1s8vZUr9QH2ZnmTeomb1bYzeiX/5k362g/wOlXXaRzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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