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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6984d782da5b36137a57b221072530be1f500a8dbe7d91bf4b8ee0a98a139c43' 
  AND token = 'PLX/Tn5rXceE17FUIevEdRjek0q9oRJ41WPGO4c/u1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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