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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15c796e395685a10d2acd0204509af37ac13e4b883c1e8b6ca6d1f934bc0b4f4' 
  AND token = '8NtkWZHpbjIjpxuylYiir7JHe+weVbnZ2ceKPOc+lDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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