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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55e782a96824784a2213c904c193f6205e8fc56f39ebc62512573eb0fed0eb71' 
  AND token = 'EbhkD/8kGBEd77IJSZo7ni7Bch6ZjZt1r2IiT9tYV7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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