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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83c453d82b908de63610dbe64c51010f6dd07e1fe285a099adc8df3b6cf54343' 
  AND token = '1XilBpNH/IQDBBzvgFdYQg6dndPdck95w8eOtQrOHH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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