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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '045ef0030b96ccea5e33ea45e3caa1204a3e9dfaa22ba2e5d5cc96278c5ec56f' 
  AND token = 'eeM50MsNBUcX5Napdvuyl5yHFVhd/iMuRXUbhk7WoZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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