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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0274c1ab32133193622bbbecdb0f49d159c1e8bb82ce73b108b965550f289618' 
  AND token = 'tebDucUF9R4AdouznDlVIW/pjNkG77inPU3PYw0aZFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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