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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f014f58756b7d44c62d65c3a670ce4f526480c809e786f0060bff8c59a077cb6' 
  AND token = 'z64drOu4J7j5FMIwLbk7lE9+yUBqn612JP3/P42WRZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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