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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ff6f878629d5bbb7ba7edbf38728641c84c882cceeff622dabcb65962551d45' 
  AND token = 'NbuYSuHtsYG52Bxs2P+I3anCeZlAt03SjJTNBByr1Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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