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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5976ecc6aff25c26689c10d7aff8f8873f38a61826bb41765a80e53cb0d0bf96' 
  AND token = 'Y4Is/f6wepXO1KQZ9LFSZwtE1NRkEKdYckw381ktVOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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