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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8061dc9f03cd7b75097eb81c9bfcd11d8365d24d814df5b0c212b0d847253205' 
  AND token = 'SOn2ciBJHi6eICLtJetQXuoolb1LIn/S+Ked/tjPhAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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