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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b42a5fa6812954ef78a5016110bbb782330404e231ddf966cf62dfb254a9d412' 
  AND token = 'yDFMt/MnqDDT5lN7Q9bULQ3xRx4qrg3AyHa7oALTPYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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